Please see our guides for configuration of DNS Failover services using
Constellix DNS in conjunction with Constellix Sonar at the link below:
http://help.constellix.com/category/advanced-dns/dns-failover/
[http://help.constellix.com/category/advanced-dns/...

All Sonar Checks are integrated with our notifications system. As soon
as Sonar detects a performance change in one of your domains, you will
be alerted immediately by:
* __Text/SMS
* __Email
* __Push Notification
Features:
Sonar supports role b...

Constellix Sonar supports monitoring over HTTP, TCP, UDP, and DNS
protocols (with more options to come). There are also options for
historical traceroutes and waterfall based checks to check web server
resource load times.
Please see our guides for confi...

Constellix Sonar is a server monitoring service that supports advanced
features, reporting, and notification of system events monitored over
HTTP, TCP, UDP, and DNS protocols (with more options to come).
Sonar monitors from an extremely geographically d...